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检索条件"主题词=convolutional code"

共 283 条记录，以下是11-20 订阅

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Research and Simulation on the Performance of Turbo code and convolutional code in Advanced Orbiting Systems

Research and Simulation on the Performance of Turbo Code and...

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5th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Wang, Chuanyu Wang, Shanshan Tian, Ye Ma, Yufeng Natl Satellite Meteorol Ctr Off Space Weather Beijing Peoples R China Shenyang Ligong Univ Sch Informat Sci & Engn Shenyang Peoples R China

ISBN: (纸本)9781467360791;9781467360777

Satellite communication is widely used in meteorological forecast. Among the satellite communication technologies, advanced orbiting systems(AOS) recommendation is an excellent one proposed by Consultative Committee for Space Data Systems(CCSDS). In AOS, the error correction coding schemes commonly used are convolutional coding, Turbo coding and RS coding. convolutional coding and Turbo coding are studied in this paper. The encoding and decoding principle of convolutional code and Turbo code are analyzed. A simulation model of AOS communication system is also established, in which convolutional code and Turbo code are used. Performance of Turbo code and convolution code are compared from three aspects: the bit error rate(BER), frame error rate(FER) and throughput. Experiments show that Turbo code works better than convolutional code from all these three aspects, especially under the condition of low Signal-to-Noise Ratio(SNR).

关键词： AOS Turbo code convolutional code bit error rate throughput

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Binary Data Correction Simulation Using convolutional code on Additive White Gaussian Noise Channel

Binary Data Correction Simulation Using Convolutional Code o...

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International Conference on Data Science and Its Applications (ICoDSA)

作者： Nuha, Hilal H. Zani, Tafta Ridha, Muhammad Fadhly Adiwijaya Telkom Univ Sch Comp Bandung Indonesia Telkom Univ Appl Sci Sch Bandung Indonesia Politekn Caltex Riau Pekanbaru Indonesia

ISBN: (数字)9781665486651

ISBN: (纸本)9781665486651

Access to digital communications in remote areas requires a mechanism to increase the robustness of the transmitted data. Many areas in Indonesia still have difficulty accessing the Internet. This is because the location of the settlement is remote from the signal transmitter convolutional codes are a technique to improve the reliability of data transmission. This article contains a simulation process of convolutional code from an application that we developed using Java. The basic difference between block codes and convolution codes in designing and evaluating is that Block codes are based on algebraic techniques or a combination whereas Convcode based on construction techniques. Some of the excellent features of this application are demo encoding, modulation, noise generation on white Gaussian noise channels, and decoding using the Viterbi algorithm. The error correcting code process begins by checking the bit similarity (hamming distance) in the code word with the trellis diagram which will produce a path with weights depending on the hamming distance. With the Viterbi Algorithm, we will decode the codeword into the initial code by finding the highest probability (Maximum Likelihood) based on the Hamming distance from each state. Experiments show that the application successfully demonstrates the system's reliability to recover information signals damaged by noise.

关键词： convolutional code white gaussian noise viterbi

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Joint Random Linear Network Coding and convolutional code with Interleaving for Multihop Wireless Network

Joint Random Linear Network Coding and Convolutional Code wi...

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IEEE 27th International Conference on Advanced Information Networking and Applications Workshops (WAINA)

作者： Susanto, Misfa Hu, Yim Fun Pillai, Prashant Univ Bradford Sch Engn Design & Technol Bradford BD7 1DP W Yorkshire England

ISBN: (纸本)9780769549521;9781467362399

Error control techniques are designed to ensure reliable data transfer over unreliable communication channels that are frequently subjected to channel errors. In this paper, the effect of applying a convolution code to the Scattered Random Network Coding (SRNC) scheme over a multi-hop wireless channel was studied. An interleaver was implemented for bit scattering in the SRNC with the purpose of dividing the encoded data into protected blocks and vulnerable blocks to achieve error diversity in one modulation symbol while randomising errored bits in both blocks. By combining the interleaver with the convolution encoder, the network decoder in the receiver would have enough number of correctly received network coded blocks to perform the decoding process efficiently. Extensive simulations were carried out to study the performance of three systems: 1) SRNC with convolutional encoding;2) SRNC;and 3) A system without convolutional encoding nor interleaving. Simulation results in terms of block error rate for a 2-hop wireless transmission scenario over an Additive White Gaussian Noise (AWGN) channel were presented. Results showed that the system with interleaving and convolutional code achieved better performance with coding gain of at least 1.29 dB and 2.08 dB on average when the block error rate is 0.01 when compared with system II and system III respectively.

关键词： Error correction code convolutional code interleaving random linear network coding mutihop transmission

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Biometrics Encryption Based on Palmprint and convolutional code 2

Biometrics Encryption Based on Palmprint and Convolutional C...

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2nd International Conference on Multimedia and Image Processing (ICMIP)

作者： Qiu, Jian Li, Hengjian Dong, Jiwen Feng, Guang Univ Jinan Shandong Prov Key Lab Network based Intelligent C Jinan Shandong Peoples R China

ISBN: (纸本)9781509059546

Based on palmprint and convolutional code, a biometrics encryption method is proposed. Firstly, the period of randomly generated keys are extended. It is then encoded with our convolutional code to get what we call a pseudo-palm code. It will be locked by XORing it with the user's reference palmprint features code. The above two aspects of processing information is stored in the smart card. During the decoding phase, the user presents his palmprint features to unlock the key. After XORing with the date on the smart card, it is then decoded with convolutional code and voted to get original keys. The scheme adopts biometrics encryption method with palmprint and convolutional code, which is more secure than single password authentication, and is more accurate than single biometric authentication.

关键词： Biometric encryptiom palmprint features keys convolutional code vote

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Joint Frame Synchronization and CCSDS convolutional code Identification Based on Correlation of codeword 5

Joint Frame Synchronization and CCSDS Convolutional Code Ide...

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Fifth International Conference on Instrumentation & Measurement, Computer, Communication, and Control (IMCCC)

作者： Li, Xue Yao, Xiujuan Wang, Chunmei Chinese Acad Sci Natl Space Sci Ctr Dept Test Technol Researching Beijing Peoples R China

ISBN: (纸本)9781467377232

In this paper, the problems involving frame synchronization and convolutional code identification for CCSDS link protocol are tackled. By combining the correlation of convolutional codeword and the theory of association rule mining, a new joint frame synchronization and code identification method is presented. It uses sequence position association to identify periodic frequent sequences and then match them with the prior knowledge of convolutional encoded CCSDS ASM. The method realizes the convolutional code identification and frame synchronization without the information of codeword starting point, the codeblock length and code rate. Theoretical analysis and simulation results demonstrate that this method can detect the code rate of CCSDS Link Protocol standard and achieve frame synchronization within a certain error rate range.

关键词： frame synchronization code identification convolutional code association rules CCSDS link protocol

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The decision schemes on the concatenation of space-time block code and convolutional code in WCDMA system

The decision schemes on the concatenation of space-time bloc...

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International Conference on Info-Tech and Info-Net (ICII 2001)

作者： Kang, GX Jin, XG Quan, QY Zhang, P Beijing Univ Posts & Telecommun Beijing 100876 Peoples R China

ISBN: (纸本)7900081585

This paper discusses the decision issue on the concatenation of space-time block code and convolutional code in WCDMA system. We compare the performance of three decision schemes, i.e., hard-decision, uniform quantization (UQ) soft-decision and adaptive uniform quantization (AUQ) soft-decision over Rayleigh fading channel. Simulation results show that both soft-decision schemes have obviously gain over 1dB than hard-decision. Moreover, if we divide the Rayleigh fading item from the output of space-time block combining, a little more performance gain is possible, thus reaches the soft-decision advantage about 2dB than hard-decision. And because the AUQ scheme changes its quantization scope according to the signal-noise-ratio (SNR), it has extra performance advantage over UQ scheme in fading channel especially at very high or low SNR. However, all of the performance gain is based on increasing the hardware implementation complexity.

关键词： diversity fading channel space-time code convolutional code concatenation decision wireless communication

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Analytical Investigation of All-Optical FEC Coding Scheme with convolutional code

Analytical Investigation of All-Optical FEC Coding Scheme wi...

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2015 International Conference on Photonics in Switching (PS)

作者： Aikawa, Yohei Uenohara, Hiroyuki Tokyo Inst Technol Precis & Intelligence Lab Midori Ku 4259 Nagatsuda Yokohama Kanagawa 2260026 Japan

ISBN: (纸本)9781479988211

In this paper, we propose an optical forward-error-correction (FEC) coding scheme with convolutional code using FWM in a HNLF to realize adaptive coding scheme corresponding to the signal-to-noise ratio between nodes. The performance of the proposed scheme was analytically investigated for 2(11) -1 PRBS DPSK-modulated RZ format signals at 10Gbps. The insertion losses of the FEC coding circuit were approximately 0.5 and -0.8dB at BER = 10(-9) in the cases of two-and three-input optical XOR operations, respectively, indicating that the proposed scheme offers a net coding gain.

关键词： convolutional codes differential phase shift keying encoding forward error correction optical fibre networks optical logic BER FEC coding circuit FWM HNLF PRBS DPSK-modulated RZ format signals adaptive coding scheme all-optical FEC coding bit rate 10 Gbit/s convolutional code forward-error-correction coding scheme insertion losses optical XOR signal-to-noise ratio Adaptive optics Encoding Logic gates Optical attenuators Optical mixing Optical sensors

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New Tighter Upper Bounds on the Performance of convolutional code over Exponentially Correlated Rayleigh Fading channel 12

New Tighter Upper Bounds on the Performance of convolutional...

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12th International Wireless Communications & Mobile Computing Conference (IWCMC)

作者： Mouchtak, Yassine El Bouanani, Faissal ENSIAS Mohammed v University in Rabat Morocco

ISBN: (纸本)9781509003044

This paper presents tighter bounds on the pairwise error-event probability and therefore very tighter upper bounds of bit error rate(BER) for communication systems employing convolutional code over Rayleigh fading channel with exponential correlation coefficient. To obtain our bound, we start by proposing a closed form upper bound for Gaussian Q-function and as well as deriving a new lower bound of each channel covariance matrix eigenvalue. The simulation results show that our proposed bound is tighter than those previously developed, especially when the covariance parameter q increases. A gain of over 6.5dB was achieved for q = 0.95 at BER=10(-5) from the better previous bound, whereas for the lower values of q we reach the simulated curve.

关键词： Performance Upper Bound Analysis convolutional code Correlated Rayleigh Fading Channel Bit Error Rate Q-Function

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The Computation of an Input-State-Output Realization of a convolutional code in order to obtain a Secure McEliece-like Cryptosystem

The Computation of an Input-State-Output Realization of a Co...

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7th International Conference on Engineering Computational Technology

作者： Climent, J. J. Herranz, M. V. Perea, C. Tomas, V. Univ Alicante Dept Stat & Operat Res Alicante Spain Univ Miguel Hernandez Ctr Operat Res Elche Spain Univ Miguel Hernandez Dept Stat Math & Informat Elche Spain

In this work, we use some results introduced by Zaballa (2008) in order to determine the input-state-output representation of a convolutional code to construct a McEliece-like cryptosystem. We construct our cryptosyst... 详细信息

ISBN: (纸本)9781905088416

关键词： convolutional code McEliece cryptosystem public key cryptosystem input-state-output representation encryption decryption Reed Solomon code controllability

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An Efficient convolutional code Information Recovery Scheme in DVB-S

An Efficient Convolutional Code Information Recovery Scheme ...

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4th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Yi Zhiqiang Li Yun Hangzhou Dianzi Univ Dept Telecommun Engn Hangzhou Zhejiang Peoples R China Hangzhou Dianzi Univ Dept Elect Engn Hangzhou Peoples R China

ISBN: (纸本)9781424421077

In DVB-S receive system, the decoder applies ergodic principle to auto-recover the convolutional code information. The general method makes decision by packet sync byte, and the recovery time is excessively long. An efficient recovery scheme is proposed to reduce the time: taking advantage of the property of "Secondary Encode", applying the decision-mechanism with confidence value and adopting finite state machine structure, and the reliability of the recovery process is guaranteed.

关键词： DVB-S convolutional code confidence value secondary encode

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